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Lecture Notes on Weather Maps, Weather Fronts and Jet Streams © 2002 Ann Bykerk-Kauffman, Dept. of Geological and Environmental Sciences, California State University, Chico* I. “Cool” Internet Sites about Weather http://accuweather.com (The Accuweather web site--lots of good color weather maps, satellite images, etc.) http://cirrus.sprl.umich.edu/wxnet/maps.html (The University of Michigan weather site; raw scientific weather maps, satellite images, etc.) http://www.nws.noaa.gov/ (The National Weather service web site, technical information, some satellite images) http://virga.sfsu.edu/ (The San Francisco State University weather site; satellite images, weather maps, archived maps from the recent past.) II. IMPORTANT Facts to Memorize A. At surface high pressure centers, air always rises / sinks (circle the correct answer) At surface low pressure centers, air always rises / sinks (circle the correct answer) B. Wherever air rises, skies are cloudy / clear (circle the correct answer) Wherever air sinks, skies are cloudy / clear (circle the correct answer) C. Aloft (high above the ground), winds are (almost) always out of the Why? North Pole 60°N 30°N Equator * Supported by NSF Grant #9455371. Permission is granted to reproduce this material for classroom use. D–95 D–96 Lecture Notes on Weather Maps, Weather Fronts and Jet Streams III. Notes on Weather Fronts A. What is a “Front?” B. What is the difference between a warm front and a cold front? C. Side view of a front (see also Figures 18.6 on p. 498 and 18.7 on p. 499 of the textbook) 1. Warm Front 2. Cold Front D. Map View of a Front (See also Figure 18.9 on p. 502 and 18.10 on p. 503 and the in-class handouts of recent weather maps) Draw the typical shape of a pair of fronts, one warm and one cold: Lecture Notes on Weather Maps, Weather Fronts and Jet Streams E. Clouds and fronts: Why are there usually clouds along weather fronts? F. From one day to the next, which way do fronts migrate? Why? IV. Jet Streams A. What is a Jet Stream? B. Why and where do jet streams form? C. Which way does the wind in a Jet Sream blow? Why? D. How are jet streams related to weather fronts? D–97 D–98 Lecture Notes on Weather Maps, Weather Fronts and Jet Streams